Safety and relief valve



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SAFETY Am) RELIEF VALVE Filed sep-1;. 25. 1922 l all ll" lllUll'lE, @DE EUSIIUN, MASSACHUSETTS, ASME-NOE, "1D0 CEUSEW MDEAEI @AGE A6 'VALVE GtlllllEAhlY, @E EDATUE', MASSACHUSETTS, A' CUEETIN @E MAESAAETTH.

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Application tled september Elfman. Serial llo. lltlgttl.

'llhis invention relates to that type ot safety or reliel valve in which the disc is so disposed that, when it lifts, the Huid under pressure escapes past the disc into a chamber, usually a spring chamber, ol which the disc forms the movable floor, or of which it is a movable part, and there accumulates and exerts a serious back pressure on the disc, thereby reducing the-litt ot' the disc andthe dislu charge from the fluid reservoir; and the` object of the invention is to prevent such accumulation olf' the Huid and to avoid the injurious effect caused thereby. rllhe invention is illustrated by the accompanying drawings, in which: Figure l is a vertical, central section-of a safety valve with the disc in elevation, and Eig. 2 is a similar fragmentary section showing a modification of the invention. v l 2u vrl["he case 1 contains the throat tube 2, whereon is seated the disc 3, which is surmounted by the spring 4 operatively disposed in the spring vchamber 5; the lower portion of said spring chamber is furnished interiorly with the adjustable sleeve 6 which isin threaded engagementtherewith, the lower portion of which sleeve encircles the disc leaving a slight clearance 7 between the sleeve and the disc. so as not to interfere withthe free action of the disc. v

lin operation, as heretolore constructed, when the'valve is attached to a fluid reservoir, the Huid fills the throat tube and, when the 'disc lifts under a predetermined pressure, while the bulk of the 'Huid escapes below the disc through the outlet, a considerable quantity ol fluid escapes past the disc into the spring chamber and there accumulates, thereby causing back pressure on the disc and seri-A ously interfering with its normal and proper l action. This back pressure occurs in a largev number of cases where the spring chamber surmounting the disc, or other chamber similarly disposed, has no outlet lor the Huid escaping into it past the disc, when the disc rises.

'.lo obviate this trouble, ll provide means for the escape of the Huid from the'spring charnber into the discharge outlet 8 for the fluid. J

As illustrated in Figure l., this object is accomplished by providing the' passage 9 1 through the wall separating the spring chamber from the discharge outlet, said passage preferably leading into the discharge outlet at an angle (as shown) adapted to secure the benefit of the eductive action of the main body ol the fluid rushing through the outlet.

A modilcaion is shown in Eig. 2, comprising a pipelO extending outwardly from the springchamber and then downwardly into( the discharge outlet.v i

'llhel maximum-eductive action'of th'e'Huid rushing through the discharge outlet may be `secured by extending the passage 9 or pie 10 into the outlet 8 preferably in the form o a @5 nozzle 11 (lFigfQ). which nozzle. may however be omitted, if desired.

A' safety valve comprising la throat tube terminating in an opening, a spring operated valve disc 'normally closing the opening, a chamber above the valve disc enclosing the spring, an outlet chamber through which lluid vapor escapes upon opening ol the valve disc, and connections between the spring chamber and outlet chamber designed to permit the escape of Huid vapor from the spring chamber and reduce the pressure in the spring chamber by virtue of the eductive ellect 'ol vapor flowing through the outlet chamber.

EAllREllElhD E. RAYM. 

